package com.van.service;

import java.util.List;

import com.van.pojo.User;

public interface UserService {
	List<User> selectAll();
	User selectById(int userid);
	User selectByUsername(String usernname);
	void insert(User user);
	void update(User user);
	void delete(User user);
	void deleteByUsername(String username);
}
